Adding Portal Configuration Only Mode configuration

[CrowleyRajapakse]

Issue

fixes wso2/api-manager#2687

Related PR

wso2/carbon-apimgt#12342

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 24.29%. Comparing base (32b7e01) to head (a21158d).
Report is 1 commits behind head on master.

❗ Current head a21158d differs from pull request most recent head 9d36969. Consider uploading reports for the commit 9d36969 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13431      +/-   ##
============================================
- Coverage     24.30%   24.29%   -0.01%     
+ Complexity     1240     1239       -1     
============================================
  Files           254      254              
  Lines         11489    11489              
  Branches       1200     1200              
============================================
- Hits           2792     2791       -1     
- Misses         8670     8671       +1     
  Partials         27       27              

Flag	Coverage Δ
integration_tests	24.29% <ø> (-0.01%)	⬇️

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